DOI: 10.1016/j.palaeo.2014.04.002
论文题名: Isotopic records from archeological giant clams reveal a variable climate during the southwestern Pacific colonization ca. 3.0ka BP
作者: Duprey N. ; Galipaud J.-C. ; Cabioch G. ; Lazareth C.E.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 404 起始页码: 97
结束页码: 108
语种: 英语
英文关键词: Climate variability
; ENSO
; Giant clam
; Lapita
; Southwest Pacific
; Stable isotopes
英文摘要: The Lapita colonization, which occurred in the late Holocene, is one of the most remarkable prehistorical human colonizations. To explore the possible influence of El Niño-Southern Oscillation (ENSO) on this event, bulk oxygen (δ18Oshell) and carbon (δ13Cshell) stable isotope records were obtained from eight fossil Tridacna sp. and Hippopus hippopus giant clams, unearthed from Lapita archeological sites of New Caledonia and Vanuatu. These giant clams were dated ca. 3.8-2.3ka BP. These δ18Oshell and δ13Cshell records were used as proxies for combined sea surface temperature and salinity and precipitation. In addition, geochemical records were obtained from modern conspecifics from New Caledonia to create a baseline against which fossil giant clam records could be compared.The isotopic records revealed the occurrence of two distinct climate states in New Caledonia ca. 3.2-2.3. ka BP: one climate state was characterized by climatic conditions similar to those observed today and the second was comparable to warmer and wetter conditions similar to Vanuatu's modern climate. Considering that previous paleo-climate reconstructions in the West Pacific did not show a shift of the mean climatic state and that they revealed a weak centennial climate variability, our results suggest that the climatic mean state has been alternating between these two states at a decadal or an inter-annual frequency. This strong climate variability recorded in the giant clam shells may reflect an increase in the ENSO variability, supporting the hypothesis of an ENSO-forced Lapita colonization as suggested by Anderson et al. (2006). © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69344
Appears in Collections: 过去全球变化的重建
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作者单位: IRD-Sorbonne Universités (UPMC, Univ Paris 06)-CNRS-MNHN, LOCEAN Laboratory, IRD France-Nord, 32, avenue Henri Varagnat, F-93143 Bondy, France; UMR PALOC, IRD, Museum National d'Histoire Naturelle, 57 rue Cuvier, CP 26, 75231 Paris cedex 05, France; The Swire Institute of Marine Science, Faculty of Science, The University of Hong Kong, Cape d'Aguilar Road, Shek O, Hong Kong
Recommended Citation:
Duprey N.,Galipaud J.-C.,Cabioch G.,et al. Isotopic records from archeological giant clams reveal a variable climate during the southwestern Pacific colonization ca. 3.0ka BP[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,404